Mark Levinson RS-232 Use and maintenance manual

No320S preamplifier

RS-232 control guide

Overview

Overview The Mark Levinson No320S preamplifier is equipped with an RS-232

control port. A complete set of command inputs and status outputs allow control of

the No320S by an external control system (such as AMX or Crestron). This guide

contains connection details and the RS-232 command list.

Contacting

Technical

Support

Phone

860-346-0896

9am to 5pm EST Monday thru Friday

Fax

860-347-6251

Please allow 24hrs for reply

madts@harman.com

Please allow 24hrs for reply

Connection

RS-232 Port

Location RS-232 control is through an RJ-11 connector located on the back of the No320S next

to the IR output. This connector has 6 pins of which only three are used for

communication.

RS-232 Port Pin

Configuration. The No320S will receive control data on pin 2 Data Receive and transmit status data

on pin 3 Data Transmit. The connection Cable between the No320S and the control

device will need to be configured so that the No320S’s receive is connected to the

control devices transmit. Please refer to the product owner’s manual for the control

device you are using for RS-232 port type and configuration.

Pin 2 Rx from the PC / Data Receive

Pin 3 Tx to the PC / Data Transmit

Pin 5 Digital system ground

RX TX GND

RS-232 Control

Cable Madrigal Audio Labs offers several parts to help communicate via RS-232 to the

No320S. The following parts can be order from Madrigal Audio Labs Technical

Support.

Part # Description

MRC878 DSUB9 to RJ-11 Adaptor and 2 meter RJ-11 to RJ-11 Cable

MRC808 DUB9 to RJ-11 Adaptor

MLC732 2 meter RJ-11 to RJ-11 Cable

For general purpose and short cable runs to the No320S, Part # MRC878 contains

everything needed.

For cable lengths of more then 2 meters - Part # MRC808 and the length of cable

needed should be ordered.

RS-232 control units with port types other then DSUB9 will need to have the cable

constructed. To construct a cable please follow the example below.

Control Cable

Example As an example on making the cable we will use the most common connector used,

which is a DSUB9. The No320S only needs 3 pins to control the unit via RS-232. As

mentioned earlier the No320S’s pin 2 Data Receive must connect to the control

devices Transmit. Please read the notes below before constructing the RS-232

cable.

qVerify Control Devices RS-232 Port Type and Configuration – Refer to Control

Device Owners Manual

qDetermine length of cable needed – Check the control device owners manual for

length limitations

qHave all available parts

Before

Constructing the

Communications

Cable

o Length of Cable needed

o RJ-11 Connector

o Connector type used by RS-232 device

Cable Layout The following diagram shows how to construct a basic DSUB9 to RJ-11 Cable.

Cable Connections

No320S RS-11

Pins

Controller DSUB9

Pins

1 – NOT USED NO CONNECTION

2 – Data Receive -----Connect to----- 3 – Data Transmit

3 – Data Transmit -----Connect to----- 2 – Data Receive

4 – NOT USED NO CONNECTION

5 – Digital Ground -----Connect to----- 5 – Digital Ground

6 – NOT USED NO CONNECTION

Diagram 2 – RJ-11 to DSUB9 Cable

Pa rts Use d fo r C a b le

Digikey Pa rt# Radioshack Part #

(1) - 9 pin DSUB Female Connector A2047-ND 276-1537

(2) - 6 pin RJ-11 Connector A9027-ND 279-421

(3) - 9 pin DSUB Housing A9001-ND 276-1539

(4) - 6 Conductor Data / Phone Cable H0063 (length in feet)-ND 910-2319

(1) - 9 pin DSUB Fema le Inside View

(3) - 9 pin DSUBHousing

A sse m b le

e r m a n ufa c ture rs s

e c ific a t io ns

(2) - 6 Pin RJ-11 Connector

NO TE O rie nt a t io n o f

wiresand Attach as

sh o w n

Strip Insu la tio n p e r RJ-11

manufac turers

In st ru c t io n s

NO TE O rie nt a t io n o f

RJ-11 w ith C lip Fa c ing

Down

(4) - 6 Conductor Data / Phone Cable

Cut wires

1 / 4 / 6

from cable

Command list

Settings: 38.4K baud, 1 stop bit, no parity

Format: !<command><cr> or !Vxx.x<cr>

The '!' is used as a framing character and can be sent any time to reset the

packet reception code. Note that all commands are 5 bytes ( '!' + 3char command

+ <cr> ) with the exception of the direct volume command which is 7 bytes ( '!' +

'V' + 4 bytes data + <cr> ) <cr> = 0x0d, carrage return.

Example: !GI1<cr> ( selects input 1 on No320S)

Keys:

COMMAND DESCRIPTION

KVD Volume "key" down

KVU Volume "Key" up

KBA Balance Key

KSU Setup Key

KEN Enter Key

KST Standby Key

KMU Mute Key

KMO Mono Key

KIP Input select previous "key"

KIN Input select next "key"

KPO polarity key

KDI Display Intensity key

Note on ramping volume:

Repeated “EV_VOL_DOWN” or “EV_VOL_UP” key commands must be

sent at less than 150mS intervals to cause a smooth, accelerated ramping of

volume like the effect of holding the volume up or down key on the remote

control.

Directs:

COMMAND DESCRIPTION

GOP Go to Operate mode

GST Go to Standby mode

GMU Go to mute

GMN Restore volume

GI1 Go to input 1

GI2 Go to input 2

GI3 Go to input 3

GI4 Go to input 4

GI5 Go to input 5

GI6 Go to input 6

GI7 Go to input 7

Note: “GI7”selects either input 7 or phono input if installed.

GBA Go to balance mode

GBE Exit balance mode

IOF Go to display intensity 0

I25 Go to display intensity 25%

I50 Go to display intensity 50%

IFU Go to display intensity 100%

Status:

COMMAND DESCRIPTION

MON Enable RS232 status updates

(default)

MOF Disable RS232 status updates

Note: The monitor on/off setting is not saved

and restored through power off->on cycles

Volume direct:

COMMAND DESCRIPTION

Vxx.x Set volume level directly

Note: Rounds to nearest whole dB step for volumes less that

23.0

Example: V65.0<cr> (sets No320S volume to 65.5)

Query:

COMMAND DESCRIPTION

QAL Request entire current No320S status

Note: Sends all 6 status lines shown below regardless of

monitor on/off

Status Update:

Any change in the following 6 control keys will automatically send out the

corresponding ASCII string.

CONTROL KEY RETURNED VALUE COMMENT

Select knob 1:IN:<1-7>:<input alias><cr> or

1:IN:NONE<cr> if no current valid input

selection input alias> is max 7 chars, no

null termination

input alias = first 7 ascii

characters from No320S

LED display.

Volume knob 2:VOL:xx.x<cr> or 2:VOL:OFF<cr> xx.x = last 4 ascii characters

from No320S display

Mute 3:MUTE:ON<cr> or 3:MUTE:OFF<cr> ON = user mute engaged,

OFF = normal volume

Mono 4:MONO:ON<cr> or 4:MONO:OFF<cr> ON = mono , OFF = normal

stereo

Polarity 5:POL:ON<cr> or 5:POL:OFF<cr> ON = polarity reversed, OFF

= normal

Standby 6:STDBY:ON<cr> or 6:STDBY:OFF<cr> ON = standby active, OFF =

normal operating mode

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